Plant Maps
Find the Plantmaps Plant and Tree Hardiness Zone for Your Zipcode:

Interactive Plantmaps Gardening and Plant Hardiness Zone Map for Illinois

Using the 1990 USDA Hardiness Zone classifications, this updated interactive version covers the state of Illinois and was compiled using National Weather Service climate data through 2009 and covering a broader time frame than the 30 year range used in the current USDA map.

Plantmaps Zone 4a

-30°F to -25°F

Plantmaps Zone 4b

-25°F to -20°F

Plantmaps Zone 5a

-20°F to -15°F

Plantmaps Zone 5b

-15°F to -10°F

Plantmaps Zone 6a

-10°F to -5°F

Plantmaps Zone 6b

-5°F to 0°F

Plantmaps Zone 7a

0°F to 5°F

What are Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones?

Hardiness Zones, Gardening Zones, Growing Zones and Plant Zones refer to defined geographic regions that can support specific plants, flowers and trees. The zones define a minimum range of temperatures that a plant or tree can survive safely in that zone. The most commonly used Hardiness Zones were defined by the USDA and contain data from the period 1960-1990. This updated version of the map was created by Plantmaps and includes climatology data through December 2009. This map also uses a wider range of climate data than the current USDA map, which limits the zones to 30 years of data.